Pytest fixture

#pytest   #unittest   #python  

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Table of Content

Fixture are function that help us to arrange the domain/ environment before test and then help us to clean the mess after the test

Demo

• Use fixture for multiple tests

demo.py

def hello(name):
    return f"hello {name}"

def bye(name):
    return f"bye {name}"

test_demo.py

# fixture demo
from demo import hello, bye
import pytest

@pytest.fixture
def name():
    return "me"

def test_hello(name):
    result = hello(name)
    assert result == "hello me"

def test_bye(name):
    result = bye(name)
    assert result == "bye me"

fixture

pytest look for matching fixture name

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Demo II

• Use fixture as setup and teardown/clean

from typing import Callable
from typing import Iterator
import pytest

@pytest.fixture
def setup() -> None:
    print("run setup fixture before test")

@pytest.fixture
def setup_teardown() -> Iterator[None]:
    print("run setup fixture before test")
    yield
    print("run teardown fixture after test")


def test_with_fixture(setup: Callable) -> None:
    print("run test")
    assert True

def test_with_fixture_II(setup_teardown: Callable) -> None:
    print("run testII")
    assert True

run pytest verbose

python -m pytest -s <test file>